INGREDIENTS
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1 box brownie mix (9x13 pan size)
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Water
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Vegetable oil
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Egg (as called for on brownie box)
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1/2 cup unsalted butter, softened
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3/4 cup creamy peanut butter
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1 teaspoon vanilla
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1/4 cup brown sugar
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1-3/4 cups powdered sugar
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Milk, as needed
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1-1/2 cups milk chocolate chips
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3 Tablespoons butter